The readme for this hourly solar wind magnetic
field data.
The readme for this hourly solar wind magnetic
field data.
This data set was created at GSFC/SPDF in 2010
by taking averages over the 1-min magnetic field data at
https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/merged/.
We used the solar wind flags in those records to
build hourly averages for this data set only from
1-min values taken in the solar wind. Hours having
more than half of their 1-min magnetic field values
not in the solar wind did not have hourly averaged
field values computed.
The spacecraft position values (words 5-9), the
field intensity (word 10) and the GSE and GSM
cartesian components (words 14-18) were computed
from corresponding 1-min values. Data for 00:00-
01:00 were used for the first hourly average of the
day. Words 11-13 were computed from the hourly
averaged GSE cartesian components. The number of
points is the number of 1-min values (themselves
averages) contributing to the hourly average. The
sigma's (standard deviations) carry no memory of
the sigma's in the 1-min averages.
This data set has annual files of hourly IMP 8 magnetic
field averages, in ASCII format. Every hour is
represented; those for which there are no IMP solar
wind data have fill values in their data words.
----------------------------------------------------
The words in each data record are:
WORD FORMAT Fill Value MEANING UNITS/COMMENTS
1 I5 Year 1963, 1964, etc.
2 I4 Decimal Day January 1 = Day 1
3 I3 Hour 0, 1,...,23
4 I4 999 # of points in the IMF averages
5 F6.1 999.9 X, GSE (Re)
6 F6.1 999.9 Y, GSE (Re)
7 F6.1 999.9 Z, GSE (Re)
8 F6.1 999.9 Y, GSM (Re)
9 F6.1 999.9 Z, GSM (Re)
10 F6.1 999.9 Field Magnitude Average |B| 1/N SUM |B|, nT
11 F6.1 999.9 Magnitude of Average Field Vector sqrt(Bx^2+By^2+Bz^2)
12 F6.1 999.9 Lat.Angle of Aver. Field Vector Degrees (GSE coords)
13 F6.1 999.9 Long.Angle of Aver.Field Vector Degrees (GSE coords)
14 F6.1 999.9 Bx GSE, GSM nT
15 F6.1 999.9 By GSE nT
16 F6.1 999.9 Bz GSE nT
17 F6.1 999.9 By GSM nT
18 F6 1 999.9 Bz GSM nT
19 F6.1 999.9 sigma|B| RMS Standard Deviation in average
magnitude (word 10), nT
20 F6.1 999.9 sigma B SQRT[sigma(Bx)**2 + Sigma(By)**2
+ Sigma(Bz)**2], nT
21 F6.1 999.9 sigma Bx RMS Standard Deviation in GSE
X-component average, nT
22 F6.1 999.9 sigma By RMS Standard Deviation in GSE
Y-component average, nT
23 F6.1 999.9 sigma Bz RMS Standard Deviation in GSE
Z-component average, nT
--------------------------------------------------------------------------------
-----------------------------------------------------------------
Related data and directories:
SPDF Data and Orbits Services
-------------------------------------------------------------------
SPDF Contact:
Natalia Papitashvili
-------------------------------------------------------------
Please acknowledge NASA's Space Physics Data Facility and
and relevant scientists identified above for data usage.
--------------------------------------------------------
Authorizing NASA Official: Dr. R.E. McGuire, Head, SPDF, NASA Goddard Space Flight Center
301-286-7794, e-mail: Robert.E.McGuire@nasa.gov
-------------------------------------------------------------------------
-----------------------------------------------------------------------